Pump piston rod packing assembly



Dec. 11,1945. A. R MAIER 2,399,602

PUMP PISTON ROD PACKING ASSEMBLY Filed March 20, 1944 Patented Dec. 11, 1945 PUMP Pis'roN non PACKING ASSEMBLY August R. Maier, Oil City, Pa., assigner-to Oil Well Supply Company, a corporation of New Jersey Application March 20, 1944, Serial No. 527,282

1 claim.

This invention relatesto improvements in a piston rod packing assembly, particularly adapted for the fluid end of reciprocating slush pumps.

The uid or mud delivered by this type of pump in well drilling operations is highly abrasive and the power portion of the pump must be protected therefrom, as for example, in the event that such fluid cuts through and escapes from the fluid end rod packing. It has been found that such leakage will follow the piston rod and eventually enter the power end of the pump, contaminating the lubricating system or scoring the working parts of said power end.

My invention contemplates a pump piston rod packing assembly for the yfluid end of such apump or the like, in addition to the conventional packing or stuiing box thereof, which assembly will serve to both divert the escaping fluid and prevent the same from following the piston rod to' the power end of said pump. I also have in view the provision of such an assembly which is capable of ready application to existing as well as new pumps in combination with the conventional packing or stufng box at the fluid end thereof. Additional objects and advantages will become apparent from the following description takenin connection with the accompanying drawing wherein:

Fig. 1 is a sectional view through portions of the fluid and power ends of a reciprocating slush pump, showing the application of my invention thereto;

Fig. 2 is a, cross section taken on the line II-II of Fig. l;

Fig. 3 is a cross section taken on the line III-III of Fig. 1; and

Figs. 4 and 5 are sectional views illustrating dilerent forms of the packing assembly of m'y invention.

Referring to the drawing, A designates the iiuid end or cylinder of a reciprocating slush pump or the like having a power end B connected by an intervening frame portion or cradle C. The piston rod 2 extends between the pump ends A 4and B within the cradle C, passing through a stuning mud being pumped cuts through packing 6, it escapes under considerable velocity, owing along the piston rod 2 and entering the power end B through stufling box 3, to the ultimate injury o the power mechanism.

To obviate the destructive eiects of such escaping fluid, I provide an additional packing as-` sembly in conjunction with the packing 6 which assembly will both divert the ilow of escaping uid and prevent the same from following the piston rod 2. This assembly includes a gland or cylindrical sleeve 'l fitting the counterbore 5 and a second stuing box or packing means, generally designated atrae in the drawing. The second packing means includes a packing container 9e engaging a shoulder llla of the gland l and to containing a packing lla. The container 9a is secured to the end wall Il by means of studs l2', whereby a compression pressure may be applied through the gland l to the packing 6 to displace said packinginto Isealing engagement with the piston rod 2.

The gland l is provided with upper and lower openings i3, through which a cleansing liquid such as water or oil may ow from a supply pipe l to continually wash the surface of the rod 2 between the packing means. The cylindrical portions of the gland 'l disposed laterally on either side of the rod 2, conlne the passage of such cleansing liquid and insure the contact thereof with substantially the entire periphery of the piston rod. In the event of failure of the packing 5, the discharging fluid escaping therefrom along the rod 2 will be diverted and discharged through the openings I3 in the gland 1, thereby preventing the major portion of said fluid from passage thereof in the direction of the power end B of the pump. Also, in the event of such leakage, any escaping uid reaching the 4packing Il will be prevented from continuing along the piston rod toward said pump power end.

As particularly shown in Figs. 4 and 5, the second packing means 8a includes the packing container 9a having abutting engagement with 'a `shoulder of the gland 'l at llla for compression of the packing 6 as described, the packing lla in the member 9B being-f the self-sealing type, whereby said packing prevents the passage .of escaping fluid outwardly along the piston rod through the container irrespective of the adjusted position of the latter.

It will readily be seen that the packing assembly of my invention may be applied to and incorporated with theusual packing 6, the gland 'l acting as .the follower therefor and upon which a second-packing meansis mounted in the manner described. The said assembly provides an effecl claim.

A piston rod packing assembly for the nuid end of reciprocating slush pumps and the like having a conventional rod packing, including a cylindrical gland on the rod having one end thereof engaging said conventional packing, said gland having upper and .lower openings and cylindrical side portions spaced from the rod for the application of a washing fluid to and the discharge there'- of from said rod, a packing container on the rod abutting the other end of said gland, means for adjusting the position of said container in relation to the rod packing to adjust the latter through the intervening gland, and a self-acting packing on the rod in said container operable to prevent the passage of iluid from said gland outwardly along the rod through said container irrespective of the adjusted position of the latter.

AUGUST R. MAIER. 

